Gallia as support of Pt in benzene hydrogenation reaction

Ethylene Hydrogenation over Pt/Ga2O3/Al2O3 Catalysts

“…It is known that the presence of chlorides induces high Pt dispersions [14]. However, the absence of a promotion effect of gallia on dispersion was observed when the gallia content was increased to 13 wt.% or platinum was supported on gallia and, instead, this oxide produced a decrease in the dispersion similar to that reported in a previous work [15].…”

“…In our previous work [15], it was found by TPR that gallia was reduced and interacted with Pt particles. The extremely high H/CO ratios, which increased from 3.5 to 5.4 with increasing reduction temperature for PtGa catalyst, indicate that an encapsulation of Pt particles by reduced Ga species affected in different degrees the accessibility of these adsorbates (CO and H 2 ) into the Pt surface.…”

“…On the contrary, the catalysts with the higher gallia contents (Pt13GaAl and PtGa catalysts) presented very low conversions and a less pronounced deactivation. The strong deactivation of the PtAl and Pt1GaAl catalysts can be attributed to the coke deposition on the actives sites of the Pt surface [15]. Table 3 show the values of the initial ethylene conversions, measured at 1 min of reaction time, as a function of the reduction temperature for the low gallia content (PtAl and Pt1GaAl) and high gallia content (Pt13GaAl and PtGa) catalysts, respectively.…”

DFT-based modeling of benzene hydrogenation on Pt at industrially relevant coverage

“…The activity of the hydrogenation pathway via acidic supports is however thought to be similar to the activity on the Pt phase, as long as no sulfur containing molecules are present that deactivate the Pt phase [28,29]. The mechanism is however not fully understood, since the inclusion of Ga 2 O 3 to add acidity to a Pt/Al 2 O 3 catalyst surprisingly decreases the benzene hydrogenation activity [30], so the mechanism is more complex than adding acidity only. When it comes to modeling these effects in ab initio calculations, incorporating the support into the ab initio calculations complicates these significantly [31], and therefore the first approach is to focus on the metal phase in this work.…”

Investigation of the Catalytic Performance of a Novel Nickel/Kit-6 Nanocatalyst for the Hydrogenation of Vegetable Oil

“…The most conventional oxide supports are alumina (Al 2 O 3 ) [7,8] and silica (SiO 2 ) [9,10]. Basic magnesia (MgO) [11,12], a variety of reducible oxides, like titania (TiO 2 ), ceric oxide (CeO 2 ) [13,14], zirconia (ZrO 2 ) [15,16], Gallia (Ga 2 O 3 ) [17,18] and alloy forming oxides, that is, zinc oxide (ZnO) [19], stannic oxide (SnO 2 ) [20,21] have also been studied in hydrogenation reactions. A comparison of different oxides in hydrogenations was performed with Ru [22], Pt [23], Pd [24], and Cu [25].…”